Earlier quoted context omitted.
We should have given up eastern Ukraine, negotiate peace. Better surrender a part than destroying the whole country. We get hyperinflation, giving money to USA's weapons industry, general destabilization, and a lot of dead Ukranians. All because it's politically weak to negotiate with Russia. Only Macron tried and he was sadly ridiculed. Does nobody remember how Sarkozy helped with Georgia's peace negotiations?
Is that what you said about Crimea? Where does it stop?
There is no way to know how Russia will behave exactly, but we DO know that they stopped invading Georgia when some territory was ceded. The USA and Europe behave very differently when invading (Iraq, Afghanistan). It does not help to reduce the conflict into a bad guys/good guys story. People are dying and a whole country might get flattened to rubble.